When a posthumous child, or a child, or the issue of a child, omitted in the testator‘s will, takes under § 33-6-23 a portion of the estate of a testator, that portion of the estate shall, for all purposes of § 33-6-25 and § 33-6-26, be considered as if it had been devised or bequeathed to that child or other descendant; and he or she shall be bound to contribute with the devisees and legatees, and shall be entitled to claim contribution from them, as provided in § 33-6-25 and § 33-6-26.